While playing, pause the game (press Space), then type "DSIMAGIC" and press Space again. A yellow capsule will appear. Capture it, and you'll be able to summon any capsule or modify the game by pressing one of the keys below:

B - Opens door and adds bonus points
C - Holds the ball
D - Divides into three balls
E - Lenghtens bat
L - Laser
P - Extra player
S - Slow
F - Warp to the last level
Enter - Leave level

While playing, type "RUNCHEAT" for unlimited lives.